基于复合储能系统的矿区电网频率弹性提升方法  

Research on Frequency Elasticity Enhancement Method of Mining Area Power Grid Based on Hybrid Energy Storage System

作　　者：钟睿 滕松 梁睿 沈兴来[3] ZHONG Rui;TENG Song;LIANG Rui;SHEN Xinglai(School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116,Jiangsu Province, China;Jiangsu Laboratory of Coal Mine Electrical and Automation Engineering (China University of Mining and Technology),Xuzhou 221116, Jiangsu Province, China;State Grid Xuzhou Power Supply Company, Xuzhou 221116, Jiangsu Province, China)

机构地区：[1]中国矿业大学电气与动力工程学院,江苏省徐州市221116 [2]江苏省煤矿电气与自动化工程实验室(中国矿业大学),江苏省徐州市221116 [3]国网徐州供电公司,江苏省徐州市221116

出　　处：《电网技术》2019年第7期2291-2298,共8页Power System Technology

基　　金：江苏省“六大人才高峰”项目(XNY-046);国家电网公司科技项目(J2018078)~~

摘　　要：为构建高比例可再生能源供电的弹性矿区电网,提出了一种由废弃矿井抽水蓄能与超级电容构成的复合储能提升矿区电网频率弹性的方法。基于弹性电网框架,考虑弹性力与调频特性的重合与区别,进而针对性地提出5种弹性指标。在计及超级电容荷电状态的基础上,充分发挥抽蓄机组与超级电容各自的技术优势,使储能系统兼具能量密度高和功率密度高的特点,从系统适应能力、恢复能力及惯性能力角度提高系统频率弹性。通过此种方法,构建了能够适应负荷阶跃变化以及连续调节任务的频率闭环控制结构,在大功率设备集中启动或井下小功率设备频繁启停时有效稳定频率水平,提升矿区电网供电可靠性。最后,在MATLAB/Simulink仿真环境中搭建系统模型,通过仿真验证了文中方法的有效性。In order to construct an elastic mine power grid supplying high proportion renewable energy, a method of hybrid energy storage system consisting of abandoned mine pumped storage and supercapacitor to improve the frequency elasticity of the mine grid is proposed. Based on the elastic grid framework, considering the coincidence and difference between elastic force and frequency modulation characteristics, five elastic indicators are proposed in a targeted manner. Taking the state of charge of the supercapacitor into account, the technical advantages of the pumping unit and the supercapacitor are fully utilized, so that the energy storage system has the characteristics of high energy density and power density. The frequency flexibility of the system is increased from the aspects of adaptability, resilience and inertia. With this method, a closed-loop frequency control structure capable of adapting to load step change and continuous adjustment task is constructed. The effective frequency level is effectively stabilized when the high-power equipment is started intensively or underground small-power equipment frequently starts and stops, and the power supply reliability of the mine area is improved. Finally, a system model is built in MATLAB/ Simulink, and effectiveness of the proposed method is verified with simulation.

关 键 词：弹性电网 复合储能 频率调节 矿区电网 

分 类 号：TM721[电气工程—电力系统及自动化]